2H2(g)+O2(g) ---> 2H2O(l)

Question

delta H= -572kJ/mole of O2

Calculate the amount of heat evolved when 10g of hydrogen are burned in excess oxygen.

Answer 1

572 kJ/mol O2 = 572 kJ/32g O2 = 572 kJ/4g H2.
572 kJ x (10/4) = ? kJ.